Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Additional Information (Detail)

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INCOME TAXES - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]            
Effective income tax rate       22.30% 27.20% 21.40%
Loss on mark to market of defined benefit plan, tax benefit   $ (1,600) $ (571) $ 784    
Loss on mark to market of defined benefit plan $ 3,300 (6,500) (2,400)      
Transformation cost       380 $ 348 $ 255
Effective income tax rate reconciliation, nondeductible expense, restructuring charges, amount       95 83 59
Effective income tax rate reconciliation, nondeductible expense, impairment losses, amount       11 57  
Legal contingencies     97     97
Benefit related to legal expenses     6     6
Operating lease carryforward     68     68
Tax benefit from share-based compensation       $ 105 $ (28)  
Reduction of effective tax rate due to share-based compensation benefits       0.60% (1.50%)  
Deferred tax expense       $ 1,645 $ (858) 100
Income tax benefit       (3,705) (501) (1,212)
Income tax holiday, decrease of non-U.S. tax expense       $ 61 $ 35 $ 27
Income tax holiday, per share impact (usd per share)       $ 0.07 $ 0.04 $ 0.03
Change in valuation allowance       $ 34 $ 34 $ (58)
Non-U.S. loss carryforwards 674     674    
Undistributed earnings of foreign subsidiaries 5,400     5,400    
Indefinitely reinvested undistributed earnings of foreign subsidiaries 834     834    
Deferred tax liability 2,949     2,949    
Gross unrecognized tax benefits that would impact effective tax rate, if recognized 479 $ 332 $ 171 479 332 $ 171
Other non-current liabilities            
Income Taxes [Line Items]            
Deferred tax liability 123     123    
Discontinued Operations | UPS Freight            
Income Taxes [Line Items]            
Gain (loss) on disposition of business       46    
Disposal Group, Held-for-sale, Not Discontinued Operations | UPS Freight            
Income Taxes [Line Items]            
Asset impairment charges         $ 686  
Federal            
Income Taxes [Line Items]            
Operating loss carryforwards 185     185    
Operating loss carryforwards subject to expiration $ 18     $ 18